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1 International Journal of Applied Mechanics and Engineering

1 2002

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CFD modelling of bubble-driven flow

Laux H., Bech L. R., Hellevik L. R., Johansen S.T.

International Journal of Applied Mechanics and Engineering

2002

Vol. 7, no 1

329-359

Bubble-driven flows, which belong to the large group of bubbly multiphase flows, are important in many industrial processes. Relevant examples are metal refining operations such as tapping of steel furnaces, gas-stirred lades, and aluminum electrolysis. Over the last 15 years, numerical solutions of mathematical models for bubble-driven flows have contributed to a better understanding of the governing physical mechanisms, and thus allowed optimization of existing or aided the design of new industrial processes. The first part of this paper gives a short, although not complete, introduction to CFD modeling of bubbly flows (Computational Bubble Dynamics, CBD). The other presents examples of modeling of bubble-driven flows: (1) bubble-driven flow in aluminum electrolysis cells; (2) flow pattern in steel ladles during tapping of steel furnaces; (3) flow pattern in a gas-stirred ladle. The mathematical models are described but only modifications to standard models that were necessary to study above-mentioned flows are discussed in greater detail. Some simulation results of these industrial relevant cases are presented. Improvements to the present modeling that seem necessary in the future are addressed.